Hardship is more reasonable than Change in Circumstance .
时至今日，WTO及其前身GATT已经走过了半个多世纪的历程。这期间，目睹了世界经济情势的巨大变迁。
WTO and its precedent GATT have undergone a course of over half a century by now , during which the world has witnessed dramatic changes in international economy .
情势变迁